Have Panasonic CT-25g7f Chasis FP361

I believe the uPC is damaged as the PC will startup fine manually or
with remote; right after it will go in to the menu setup with or w/o
control remote usage and will only go into the same menu option (into
menu, first menu option and the exit menu). Only one menu option or TV
option works and it is the one that says that the tube is ok and tested
ok.
My guess is that the IC replacement will not be worth the time and
money involved. As the TV displays ok and the tube is Ok; I would like
to know if it is possible to somehow force the tuner on the TV to
manually work on channel 3 or 4 (for video input) or if there is a way
for the a/v inputs to be activated on startup for video display. Any
pointers will be appreciated. thanks